Gunnar sits next to 4 phonetic neighbors — Gunner, Gunter, and Conor are the closest matches by sound. Most share Gunnar's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bold warrior, battle army"
"the twin"
"high mountain, exalted"
"divine inspiration, fury, frenzy"
"battle strength"
"bear"
"victory of the people"
"noble friend, elf friend"
"severe, strict"
"staff of the Goths"
"ruler's counsel"
"to live, to dwell"
"victory of the people"
"meadow land"
"healer, physician"
"dragon"
"brave warrior (later folk etymology)"
"peaceful, gentle as a dove"
Similar sound: These names share phonetic patterns with Gunnar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Gunnar.
Rhythm: Gunnar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.